Rhizoprionodon acutus, Milk shark : fisheries, gamefish

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Rhizoprionodon acutus (Rüppell, 1837)

Milk shark
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Rhizoprionodon acutus   AquaMaps   Data sources: GBIF OBIS
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分类 / Names 俗名 | 同种异名 | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii 板鳃亚纲 (鲨鱼与 鱼) (sharks and rays) > Carcharhiniformes (Ground sharks) 白眼鮫目 (Ground sharks) > Carcharhinidae (Requiem sharks) 白眼鮫科 (Requiem sharks)
Etymology: Rhizoprionodon: Greek, rhiza = root + Greek, prion = saw + Greek, odous = teeth (Ref. 45335).  More on author: Rüppell.

Environment: milieu / climate zone / depth range / distribution range 生态学

; 海洋; 淡水; 半咸淡水 底中水层性; 非产卵性溯降河的 (Ref. 51243); 深度上下限 1 - 200 m (Ref. 244).   熱帶; 41°N - 30°S, 27°W - 156°E

分布 国家 | FAO区域 | 生态系 | 标本纪录 | Point map | 简介 | Faunafri

Eastern Atlantic: Mauritania to Angola; reported from the Gulf of Taranto (Ref. 231). Indo-West Pacific: Persian Gulf (Ref. 68964), Red Sea and East Africa to Indonesia, north to Japan, south to Australia.
東大西洋: 馬得拉群島與茅利塔尼亞到安哥拉; 記錄自塔倫多灣了。 (參考文獻 231) 印度-西太平洋: 紅海而且東非到印尼,北至日本, 南至澳洲。

Length at first maturity / 大小 / 重量 / 年龄

Maturity: Lm ?, range 70 - 80 cm
Max length : 175 cm TL 雄鱼/尚未辨别雌雄; (Ref. 12693); 80.8 cm TL (female); common length : 110 cm TL 雄鱼/尚未辨别雌雄; (Ref. 47737); 最大体重: 5.0 kg (Ref. 40637); 最大年龄: 8 年 (Ref. 244)

简单描述 型态特徵 | 形态测量图

背棘 (总数): 0; 背的软条 (总数): 0; 臀棘 0; 臀鳍软条: 0. A small shark with a long, narrow, snout, big eyes without notches, long labial furrows, and oblique-cusped teeth which may be smooth-edged or weakly serrated; 2nd dorsal fin small, low and behind larger anal fin; no interdorsal ridge (Ref. 5578). Grey or grey-brown above, white below (Ref. 5578). Dorsal and anal fins with dusky or blackish edges, fins slightly darker than back (Ref. 9997).
一种小的鲨鱼有一个长的,狭窄的,和吻又大的眼没有凹槽, 长的唇沟 , 与斜尖的齿那可能是边缘平滑的或略微锯齿状的; 第二背鳍鳍小的, 低的而且在较大的臀鳍后面; 没有间背脊.(参考文献 5578) 背面灰色的或灰褐色, 腹面白色的.(参考文献 5578) 背鳍与臀鳍有暗色或黑色的边缘,鳍颜色略深的超过背面.(参考文献 9997)

生物学特性     字汇 (例如 epibenthic)

Found on continental shelves, often on sandy beaches and rarely in estuaries (Ref. 244). Reported to enter freshwater and recorded several times from Cambodia as far upstream as the Great Lake (Ref. 12693). Occurs near the surface in shallow waters (Ref. 12693). Feeds mainly on small pelagic and benthic bony fishes, also cephalopods and other invertebrates (Ref. 244). Viviparous (Ref. 50449). Utilized fresh and possibly dried salted for human consumption and for fishmeal (Ref. 9997). The 178 cm specimen recorded off Africa is possibly based on some other species (Ref. 9997).

栖息于大陆架了, 时常在沙滩上而且极少在河口.(参考文献 244) 报告进入淡水而且记录自来自柬埔寨的好几次往上游远达五大湖.(参考文献 12693) 生活于靠近表面在浅水区中。 (参考文献 12693) 主要吃小型大洋性鱼类与底栖的硬骨鱼类, 也捕食头足类与其他的无脊椎动物。 (参考文献 244) 胎生的.(参考文献 50449) 生鲜使用与可能地乾燥盐腌供人类消费与用于鱼粉.(参考文献 9997) 记录外海的非洲 178 公分标本是可能是一些其他的种.(参考文献 9997)

Life cycle and mating behavior 成熟度 | 繁殖 | 产卵场 | | 孕卵数 | 仔鱼

Distinct pairing with embrace (Ref. 205). Viviparous, with a yolk-sac placenta; 2 to 8 in a litter (Ref. 9997), usually 2 to 5 after a gestation period of ~ 12 months; no seasonality in the reproductive cycle (Ref.58048). Size at birth between 25 and 39 cm.東大西洋: 馬得拉群島與茅利塔尼亞到安哥拉; 記錄自塔倫多灣了。 (參考文獻 231) 印度-西太平洋: 紅海而且東非到印尼,北至日本, 南至澳洲。

主要参考文献 Upload your references | 参考文献 | 合作者 : Compagno, Leonard J.V. | 合作者

Compagno, L.J.V., 1984. FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO. (Ref. 244)

世界自然保护联盟红皮书 (Ref. 120744)

  最不相关 (LC) ; Date assessed: 30 April 2003

CITES (Ref. 118484)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

对人类的威胁

  无害处的 (Ref. 244)





人类利用

渔业: 商业性; 游钓鱼种: 是的
FAO(Publication : search) | FishSource | 周边海洋

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Estimates based on models

Preferred temperature (Ref. 115969): 19.6 - 28.5, mean 26.9 (based on 1463 cells).
Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5078   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00331 (0.00252 - 0.00435), b=3.09 (3.04 - 3.14), in cm Total Length, based on LWR estimates for this species (Ref. 93245).
营养阶层 (Ref. 69278):  4.3   ±0.4 se; Based on diet studies.
Generation time: 5.5 ( na - na) years. Estimated as median LN(3)/K based on 1 growth studies.
回复力 (Ref. 120179):  非常低的, 最小族群倍增时间超过14 年 (K=0.2-0.6; Fec=1).
脆弱性 (Ref. 59153):  High vulnerability (61 of 100) .
价格分类 (Ref. 80766):   Medium.